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Commitments and Contingencies - Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Commitments and Contingencies      
Rental expense $ 36,200 $ 34,400 $ 33,400
2017 34,096    
2018 28,053    
2019 21,936    
2020 16,448    
2021 21,751    
Thereafter 54,898    
Minimum rental payments, total $ 177,182    
Maximum      
Commitments and Contingencies      
Year in which lease with latest expiration is set to expire 2033